Patents by Inventor Apostolos Pavlos Karafillis

Apostolos Pavlos Karafillis has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20160290169
    Abstract: A turbine frame for a turbine engine having an axial centerline, the turbine frame comprising an inner hub, an outer hub encircling the inner hub, a plurality of struts extending between the inner and outer hubs and having a maximum width portion relative to the axial centerline and an airfoil comprising at least first and second fairings mounted to the inner and outer hubs and encircling one of the struts.
    Type: Application
    Filed: April 1, 2015
    Publication date: October 6, 2016
    Inventors: Apostolos Pavlos Karafillis, Martin Wayne Frash, Schuyler Javier Ortega, Angelo Parisi
  • Patent number: 8926270
    Abstract: A turbine flowpath apparatus is provided for a gas turbine engine having a centerline axis. The apparatus includes: an annular flowpath member of low-ductility material, the flowpath member having a flowpath surface and an opposed back surface, and having a cross-sectional shape comprising a generally cylindrical forward section and an aft section that extends aft and radially outward at a non-perpendicular, non-parallel angle to the centerline axis; an annular stationary structure surrounding the flowpath member; and an annular centering spring disposed between the stationary structure and the flowpath member, the centering spring urging the flowpath member towards a centered position within the stationary structure.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: January 6, 2015
    Assignee: General Electric Company
    Inventors: Apostolos Pavlos Karafillis, William Hasting, Michael Hogan
  • Patent number: 8388308
    Abstract: A system for asymmetric flow extraction is described and claimed, the system comprising a flow path, a bleed slot in the flow path, a bleed cavity for receiving at least a portion of the fluid extracted from the flow path and a bleed passage in flow communication with the bleed slot and the bleed cavity wherein the bleed passage has at least one deflector having a shape such that the width of the bleed passage cross section varies in a direction normal to the direction of fluid flow in the bleed passage. In another embodiment, the deflector has an aerodynamic surface having a shape such that the flow passage between the aerodynamic surface and a surface located away from it has a cross sectional shape that is non-axisymmetric. In another embodiment, the bleed passage comprises an assembly of a plurality deflectors, arranged circumferentially.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: March 5, 2013
    Assignee: General Electric Company
    Inventors: Apostolos Pavlos Karafillis, Kalyanasundaram Muruganathan, Samuel Rulli, David Cory Kirk, Donald Charles Slavik, Erich Alois Krammer, Manish Kumar
  • Publication number: 20120247250
    Abstract: An oil spreader for a gearbox includes: an annular body with a central axis, opposed upper and lower ends, an upper portion adjacent the upper end, and a lower portion adjacent the lower end, the lower portion comprising at least two vanes extending between the upper portion and an annular ring disposed at the lower end, the vanes defining slots therebetween.
    Type: Application
    Filed: March 31, 2011
    Publication date: October 4, 2012
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Apostolos Pavlos Karafillis, Justin Paul Pare, Niranjan Patel, Brian Devendorf
  • Publication number: 20120156029
    Abstract: A turbine flowpath apparatus is provided for a gas turbine engine having a centerline axis. The apparatus includes: an annular flowpath member of low-ductility material, the flowpath member having a flowpath surface and an opposed back surface, and having a cross-sectional shape comprising a generally cylindrical forward section and an aft section that extends aft and radially outward at a non-perpendicular, non-parallel angle to the centerline axis; an annular stationary structure surrounding the flowpath member; and an annular centering spring disposed between the stationary structure and the flowpath member, the centering spring urging the flowpath member towards a centered position within the stationary structure.
    Type: Application
    Filed: December 17, 2010
    Publication date: June 21, 2012
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Apostolos Pavlos Karafillis, William Hasting, Michael Hogan
  • Patent number: 8177513
    Abstract: In one aspect, a method for assembling an outlet guide vane is provided. The method includes providing an outlet guide vane frame having a first side and a second side. The outlet guide vane includes a radially inward flange coupled to a radially outward flange by a leading edge. A trailing edge is coupled to the radially inward flange and the radially outward flange aft of the leading edge. A cavity is defined between the radially inward flange, the radially outward flange, the leading edge, and the trailing edge. A first and a second mating surface circumscribe the cavity on the first and second sides respectively. The method further includes coupling a filler portion within the cavity wherein the filler portion includes a third side and a fourth side, coupling a first skin to the third side and the first mating surface, and coupling a second skin to the fourth side and the second mating surface, wherein at least one of the first skin and the second skin are fabricated from a composite material.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: May 15, 2012
    Assignee: General Electric Company
    Inventors: Dong-Jin Shim, Scott Finn, Apostolos Pavlos Karafillis, William Howard Hasting, Arjan Hegeman
  • Patent number: 8087880
    Abstract: Apparatus and method of operating a centrifugal compressor and active control system includes a centrifugal compressor with compressor blades mounted on an impeller, an annular cavity bounded in part by a shroud adjacent to the blades, and an active control system for controlling a clearance between the shroud and the blades by controlling a cavity pressure in the cavity. An electronic controller for controlling a control pressure valve for pressurizing using a source of compressor discharge pressure air and depressurizing the cavity respectively may open and close the valves using pulse width modulation. Pressure and clearance sensors positioned for measuring the cavity pressure the blade tip clearance respectively in signal supply communication with the electronic controller may be used. The shroud may be supported by radially spaced apart annular radially outer and inner supports connected to a casing by a bolted joint bounding the cavity.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: January 3, 2012
    Assignee: General Electric Company
    Inventors: Apostolos Pavlos Karafillis, Kenneth Allen Loehle, Robert Patrick Tameo, David Allen Gutz
  • Publication number: 20110002774
    Abstract: Apparatus and method of operating a centrifugal compressor and active control system includes a centrifugal compressor with compressor blades mounted on an impeller, an annular cavity bounded in part by a shroud adjacent to the blades, and an active control system for controlling a clearance between the shroud and the blades by controlling a cavity pressure in the cavity. An electronic controller for controlling a control pressure valve for pressurizing using a source of compressor discharge pressure air and depressurizing the cavity respectively may open and close the valves using pulse width modulation. Pressure and clearance sensors positioned for measuring the cavity pressure the blade tip clearance respectively in signal supply communication with the electronic controller may be used. The shroud may be supported by radially spaced apart annular radially outer and inner supports connected to a casing by a bolted joint bounding the cavity.
    Type: Application
    Filed: December 3, 2008
    Publication date: January 6, 2011
    Inventors: Apostolos Pavlos Karafillis, Kenneth Allen Loehle, Robert Patrick Tameo, David Allen Gutz
  • Publication number: 20100209235
    Abstract: In one aspect, a method for assembling an outlet guide vane is provided. The method includes providing an outlet guide vane frame having a first side and a second side. The outlet guide vane includes a radially inward flange coupled to a radially outward flange by a leading edge. A trailing edge is coupled to the radially inward flange and the radially outward flange aft of the leading edge. A cavity is defined between the radially inward flange, the radially outward flange, the leading edge, and the trailing edge. A first and a second mating surface circumscribe the cavity on the first and second sides respectively. The method further includes coupling a filler portion within the cavity wherein the filler portion includes a third side and a fourth side, coupling a first skin to the third side and the first mating surface, and coupling a second skin to the fourth side and the second mating surface, wherein at least one of the first skin and the second skin are fabricated from a composite material.
    Type: Application
    Filed: February 18, 2009
    Publication date: August 19, 2010
    Inventors: Dong-Jin Shim, Scott Finn, Apostolos Pavlos Karafillis, William Howard Hasting, Arjan Hegeman
  • Publication number: 20090297335
    Abstract: A system for asymmetric flow extraction is described and claimed, the system comprising a flow path, a bleed slot in the flow path, a bleed cavity for receiving at least a portion of the fluid extracted from the flow path and a bleed passage in flow communication with the bleed slot and the bleed cavity wherein the bleed passage has at least one deflector having a shape such that the width of the bleed passage cross section varies in a direction normal to the direction of fluid flow in the bleed passage. In another embodiment, the deflector has an aerodynamic surface having a shape such that the flow passage between the aerodynamic surface and a surface located away from it has a cross sectional shape that is non-axisymmetric. In another embodiment, the bleed passage comprises an assembly of a plurality deflectors, arranged circumferentially.
    Type: Application
    Filed: October 30, 2007
    Publication date: December 3, 2009
    Inventors: APOSTOLOS PAVLOS KARAFILLIS, KALYANASUNDARAM MURUGANATHAN, SAMUEL RULLI, DAVID CORY KIRK, DONALD CHARLES SLAVIK, ERICH ALOIS KRAMMER, MANISH KUMAR
  • Patent number: 7065479
    Abstract: A method for determining an equilibrium configuration for an object to be subjected to peening includes representing a bulk geometry of the object as a solid body and representing a surface of the object as a surface layer overlying the solid body. The method further includes expanding the surface layer in response to a number of thermal loads to simulate peening and balancing a number of forces on the surface layer and the solid body to determine the equilibrium configuration of the object after peening.
    Type: Grant
    Filed: May 28, 2002
    Date of Patent: June 20, 2006
    Assignee: General Electric Company
    Inventors: David Peter Mika, Apostolos Pavlos Karafillis, Dale Robert Lombardo, Steven Robert Hayashi
  • Patent number: 6679045
    Abstract: A bearing housing includes inner and outer shells through which a rotor shaft may extend. A service tube is fixedly joined to the inner shell and extends through a service aperture in the outer shell. A flexible coupling sealingly joins the service tube to the outer shell at the service aperture for permitting differential thermal movement between the inner and outer shells at the service tube.
    Type: Grant
    Filed: December 18, 2001
    Date of Patent: January 20, 2004
    Assignee: General Electric Company
    Inventors: Apostolos Pavlos Karafillis, Peter Walter Mueller, John Robert Ramsey
  • Publication number: 20030225476
    Abstract: A method for determining an equilibrium configuration for an object to be subjected to peening includes representing a bulk geometry of the object as a solid body and representing a surface of the object as a surface layer overlying the solid body. The method further includes expanding the surface layer in response to a number of thermal loads to simulate peening and balancing a number of forces on the surface layer and the solid body to determine the equilibrium configuration of the object after peening.
    Type: Application
    Filed: May 28, 2002
    Publication date: December 4, 2003
    Applicant: General Electric Company
    Inventors: David Peter Mika, Apostolos Pavlos Karafillis, Dale Robert Lombardo, Steven Robert Hayashi
  • Publication number: 20030110778
    Abstract: A bearing housing includes inner and outer shells through which a rotor shaft may extend. A service tube is fixedly joined to the inner shell and extends through a service aperture in the outer shell. A flexible coupling sealingly joins the service tube to the outer shell at the service aperture for permitting differential thermal movement between the inner and outer shells at the service tube.
    Type: Application
    Filed: December 18, 2001
    Publication date: June 19, 2003
    Inventors: Apostolos Pavlos Karafillis, Peter Walter Mueller, John Robert Ramsey
  • Patent number: 6439616
    Abstract: A retainer for non-rotatably retaining a conduit member that extends through an opening in a casing wall. The retainer has an annular top wall that includes an inner periphery having inwardly extending projections to engage the outer surface of the conduit member. Additionally, the retainer includes a depending skirt that extends from the outer periphery of the top wall. A pair of outwardly extending straps extend from the skirt and include bolt holes for enabling the retainer to be bolted relative to the casing wall. The retainer limits axial outward movement of the conduit member and also diffuses and deflects any leakage air that passes around the conduit member to avoid impingement of the leakage air against the structural components and accessories that are positioned outside the engine casing.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: August 27, 2002
    Assignee: General Electric Company
    Inventors: Apostolos Pavlos Karafillis, John Robert Ramsey, Matthew Kaminske
  • Patent number: 6370933
    Abstract: A die for reducing the formation of flash on parts includes a first die section and a second die section defining therein a cavity. The first die section includes a pair of first surfaces and the second die section includes a pair of second surfaces which together define a pair of parting lines which extend from opposite sides of the cavity. Desirably, the first die section includes a pair of lands, each extending along the length of one of the parting lines. Each land defines a first surface portion of the first surface and is sized and configured so that the land is elastically loaded, e.g., substantially equal to and less than the elastic limit of the material forming land when forming a part.
    Type: Grant
    Filed: February 23, 2000
    Date of Patent: April 16, 2002
    Assignee: General Electric Company
    Inventors: Arne Ronald Majorell, David Peter Mika, Alain Girard, Apostolos Pavlos Karafillis
  • Patent number: 6353768
    Abstract: An exemplary method of designing a manufacturing process comprises the steps of representing a workpiece as a plurality of triangular finite elements, representing the forming tools with mathematical equations which typically include cubic polynomials, simulating a deformation of the workpiece by the forming tools with a finite element model, wherein the finite element model is integrated with explicit integration. The method may be carried out with an apparatus which includes a memory device which stores a program including computer readable instructions, and a processor which executes the instructions. After the deformation of the workpiece has been simulated by the finite element model, the characteristics of the workpiece and forming tools can be modified to improve the final shape of the workpiece. After the finite element simulation produces an acceptable final workpiece shape, an actual workpiece can be formed with actual tools based on the simulation.
    Type: Grant
    Filed: February 2, 1998
    Date of Patent: March 5, 2002
    Assignee: General Electric Company
    Inventors: Apostolos Pavlos Karafillis, Michael Charles Ostrowski, William Thomas Carter, Jr., Michael Evans Graham
  • Patent number: 5949163
    Abstract: A reinforced motor for reducing amplitude of operational vibrations includes a stator having an open end, a rotor disposed through and centrally of the stator and having at least one end, an end shield mounted to the open end of the stator and having an outer surface and rotatably supporting the rotor at the one end thereof, and an elongated stiffening member attached to or formed on the outer surface of the end shield so as to increase stiffness and reduce bending of the end shield and thereby reduce amplitude of operational vibrations produced by rotation of the rotor relative to the stator. A peripheral portion of the end shield forms an opening for receiving a switch housing. The stiffening member is attached on the outer surface of the end shield adjacent to the switch housing opening.
    Type: Grant
    Filed: October 26, 1998
    Date of Patent: September 7, 1999
    Assignee: General Electric Company
    Inventors: Apostolos Pavlos Karafillis, Robert Arvin Hedeen
  • Patent number: 5846035
    Abstract: A drill according to an exemplary embodiment of the invention comprises a shank from which the drill is driven; a body connected to the shank, the body having a surface; a flute in the body; a cutting edge at a drill point; and a peripheral relief surface which extends outwardly from the surface of the body to an outer circumference of the drill, wherein the peripheral relief surface, for a cross section of the drill perpendicular to a drill axis, intersects the outer circumference at a peripheral point at an edge of the flute. The drill has an improved capacity to withstand a loss of coolant during drilling without severe overheating of the drill or workpiece and with little damage to the drill and workpiece.
    Type: Grant
    Filed: July 11, 1997
    Date of Patent: December 8, 1998
    Assignee: General Electric Company
    Inventors: Apostolos Pavlos Karafillis, Steven Robert Hayashi